Joctree is a real-time graphics engine for Java. The engine supports scene-optimization via octrees, and will support basic model and animation formats (Wavefront/Obj and Quake/MD2).
Multi-User Character Kingdom (MUCK) engine and client providing a first person view point 3D-world which can be created by users, and which uses a system to provide quick gameplay by slowly downloading Objects/Textures over time once in the world.